A strong performance by the Greens in May would be disproportionately detrimental to Labour’s electoral chances. Even on just 5% of the vote, the Green party could make a difference in several closely contested seats

For David Cameron - 48 on Thursday - it wasn’t the best birthday present. For Ed Miliband, given his recent struggles, it was just another day. Five key takeaways from the double byelection bill and the impact of the Ukip factor